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57 Permanent API jobs in Holborn, Central London + 20 miles
)
Senior Backend Engineer
Senior Backend Engineer
Plexus Resource Solutions Ltd
City of London (EC1)
From £110,000 to £150,000 per annum
Web3 / Social Product / Blockchain Infrastructure - Remote - 110k-150k - Plexus is partnering with a leading Web3 innovator building the next-generation social platform powered by blockchain. Theyre seeking a Senior Backend Engineer to architect scalable systems and help bring seamless, on-chain social experiences to life. The candidate will lead backend architecture and development for the companys social platform. Responsibilities - Design, develop, and maintain scalable backend systems and APIs. Collaborate with frontend engineers to deliver seamless user experiences. Integrate web3 technologies via third-party APIs or in-house solutions. Continuously improve infrastructure, monitoring, and engineering processes. Requirements - 4+ years of production software engineering experience, ideally at scale. Strong proficiency with TypeScript, Node.js, and AWS.
Web3 / Social Product / Blockchain Infrastructure - Remote - 110k-150k - Plexus is partnering with a leading Web3 innovator building the next-generation social platform powered by blockchain. Theyre seeking a Senior Backend Engineer to architect scalable systems and help bring seamless, on-chain social experiences to life. The candidate will lead backend architecture and development for the companys social platform. Responsibilities - Design, develop, and maintain scalable backend systems and APIs. Collaborate with frontend engineers to deliver seamless user experiences. Integrate web3 technologies via third-party APIs or in-house solutions. Continuously improve infrastructure, monitoring, and engineering processes. Requirements - 4+ years of production software engineering experience, ideally at scale. Strong proficiency with TypeScript, Node.js, and AWS.
Senior Backend Engineer
Senior Backend Engineer
Plexus Resource Solutions Ltd
City of London (EC1)
From £60,000 to £100,000 per annum
Use Rest API with Python
Use Rest API with Python
)
Senior Full Stack Engineer
Senior Full Stack Engineer
McGregor Boyall Associates Limited
City of London (EC1)
£80000 - £120000 per annum + bonus
Strong knowledge of system design principles, scalable architecture patterns, and API design.
Strong knowledge of system design principles, scalable architecture patterns, and API design.
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.Net Developer - Sports Trading
.Net Developer - Sports Trading
Client Server
The City, City of London (EC4), EC4R
£75000 - £90000 per annum + benefits
There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js.
There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js.
PREMIUM
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API Management gateways
API Management gateways
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The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
)
Front-End QA Tester
Front-End QA Tester
REC SOLUTIONS LIMITED
The City, City of London (EC4), EC4N
Competitive base Plus Discretionary Bonus and Benefits
API testing experience (REST/GraphQL) - both automated and manual * Python knowledge (for backend/API testing)
API testing experience (REST/GraphQL) - both automated and manual * Python knowledge (for backend/API testing)
138 exact matches jobs are outside your preferred location
)
Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
)
Product management, within digital services or public sector environments experienced with Apigee (preferred) or similar API management platforms, including API publishing, monitoring, and access control. * Lead the end-to-end product lifecycle for the onboarding service, from discovery through delivery and iteration for Clients API providers. * Define the long-term vision and strategy for API products, focusing on the needs of developers, clinicians, and patients. * Proven experience in product management, ideally within digital services or public sector environments experienced with Apigee (preferred) or similar API management platforms, including API publishing, monitoring, and access control. * Lead the end-to-end product lifecycle for the onboarding service, from
Product management, within digital services or public sector environments experienced with Apigee (preferred) or similar API management platforms, including API publishing, monitoring, and access control. * Lead the end-to-end product lifecycle for the onboarding service, from discovery through delivery and iteration for Clients API providers. * Define the long-term vision and strategy for API products, focusing on the needs of developers, clinicians, and patients. * Proven experience in product management, ideally within digital services or public sector environments experienced with Apigee (preferred) or similar API management platforms, including API publishing, monitoring, and access control. * Lead the end-to-end product lifecycle for the onboarding service, from
)
Senior Service Management & Integration Solution Architect
Senior Service Management & Integration Solution Architect
DXC Technology
London
Unspecified Competitive Salary & Benefits
Extensive knowledge and experience with modern ITSM tools, ITIL and API technologies, solutions, and architectures. * Service Integrations using API based policies
Extensive knowledge and experience with modern ITSM tools, ITIL and API technologies, solutions, and architectures. * Service Integrations using API based policies
PREMIUM
The successful candidate will demonstrate significant expertise in Microsoft Azure services, Web API, Azure App Service, .NET Core, and Visual Studio. * Design and implement scalable technology solutions using Web API, Azure App Service, and .NET Core to satisfy business requirements and enhance operational efficiency. * Define architectural patterns for microservices and API management. Azure API Development * Develop and maintain APIs using Azure API Management, Web API, and .NET Core to enable secure and efficient integrations. * Ensure API performance, security, and compliance with best practices. * Monitor and optimize application and API performance using Azure Monitor, Application Insights, and Log Analytics. * Expertise in Mic
The successful candidate will demonstrate significant expertise in Microsoft Azure services, Web API, Azure App Service, .NET Core, and Visual Studio. * Design and implement scalable technology solutions using Web API, Azure App Service, and .NET Core to satisfy business requirements and enhance operational efficiency. * Define architectural patterns for microservices and API management. Azure API Development * Develop and maintain APIs using Azure API Management, Web API, and .NET Core to enable secure and efficient integrations. * Ensure API performance, security, and compliance with best practices. * Monitor and optimize application and API performance using Azure Monitor, Application Insights, and Log Analytics. * Expertise in Mic
)
Senior .Net Integration Developer
Senior .Net Integration Developer
Rise Technical
Maidenhead, Berkshire
£50000.00 - £70000.00 per annum + + Training + Holiday
You will use your expertise in C#/.NET and modern APIs (REST, WebAPI, JSON, OAuth2) to build fault-tolerant, event-driven integrations, support customers and partners with API usage, and deliver clear, high-quality documentation while maintaining security, GDPR compliance, and operational reliability. Taking integration leadership, you will design and maintain well-documented financial and third-party integrations built on modern API standards. * Support customers and partners with integration setup and API usage
You will use your expertise in C#/.NET and modern APIs (REST, WebAPI, JSON, OAuth2) to build fault-tolerant, event-driven integrations, support customers and partners with API usage, and deliver clear, high-quality documentation while maintaining security, GDPR compliance, and operational reliability. Taking integration leadership, you will design and maintain well-documented financial and third-party integrations built on modern API standards. * Support customers and partners with integration setup and API usage
)
Significant expertise in API integration, containerisation, microservices and cloud platforms (AWS, O365, GCP)
Significant expertise in API integration, containerisation, microservices and cloud platforms (AWS, O365, GCP)
)
Founding Full Stack Engineer (Python/TypeScript) – London - £180K
Founding Full Stack Engineer (Python/TypeScript) – London - £180K
Halian Technology Limited
London
Up to £185,000 per annum High founding member equity and Shares
API integrations, ETL, schema validation
API integrations, ETL, schema validation
Founding Full Stack Engineer (Python/TypeScript) – London - £180K
Founding Full Stack Engineer (Python/TypeScript) – London - £180K
Halian Technology Limited
London
Up to £185,000 per annum High founding member equity
API integrations, ETL, schema validation
API integrations, ETL, schema validation
Develop API integrations (Appsflyer, Firebase, sGTM)
Develop API integrations (Appsflyer, Firebase, sGTM)
As a Technology Architect, you will leverage your expertise in Google Cloud Platform (GCP) and Apigee to design and implement robust API solutions. With a strong focus on cloud infrastructure, API security, and performance optimization, you will ensure seamless integration across enterprise systems. * Design and implement scalable API solutions using Google Cloud Platform and Apigee to meet business requirements. * Collaborate with cross-functional teams to integrate Apigee API Hub and Apigee Hybrid into existing systems. * Provide technical guidance on Apigee OPDK and Apigee X for optimised API management and performance. * Develop and maintain Apigee Developer Portal and Apigee Edge for streamlined API access and lifecycle management. * Implement security protocols
As a Technology Architect, you will leverage your expertise in Google Cloud Platform (GCP) and Apigee to design and implement robust API solutions. With a strong focus on cloud infrastructure, API security, and performance optimization, you will ensure seamless integration across enterprise systems. * Design and implement scalable API solutions using Google Cloud Platform and Apigee to meet business requirements. * Collaborate with cross-functional teams to integrate Apigee API Hub and Apigee Hybrid into existing systems. * Provide technical guidance on Apigee OPDK and Apigee X for optimised API management and performance. * Develop and maintain Apigee Developer Portal and Apigee Edge for streamlined API access and lifecycle management. * Implement security protocols
)
Experience with RESTful APIs, OAuth/JWT, and API security
Experience with RESTful APIs, OAuth/JWT, and API security
FEATURED
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Assist with company technical direction and architecture for mobile, cloud and API platforms
Assist with company technical direction and architecture for mobile, cloud and API platforms
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Experience of Python, Bash, API's
Experience of Python, Bash, API's
FEATURED
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Experience in creating front end and API automated test projects
Experience in creating front end and API automated test projects
Applied AI Software Engineer - London (Hybrid) - AWS Partner
Applied AI Software Engineer - London (Hybrid) - AWS Partner
Transparent Technology
London
£75000 - £150000 per annum
As a Software Engineer first, you will have deep expertise in at least one programming language (Python, Node.js, Java, JavaScript, TypeScript, React) and proven experience in productionising GenAI solutions, including integrating LLMs, LangChain, OpenAI API, or Claude.
As a Software Engineer first, you will have deep expertise in at least one programming language (Python, Node.js, Java, JavaScript, TypeScript, React) and proven experience in productionising GenAI solutions, including integrating LLMs, LangChain, OpenAI API, or Claude.
)
Proficiency in API development, integration testing, and cross-platform troubleshooting.
Proficiency in API development, integration testing, and cross-platform troubleshooting.
Automation skills (PowerShell, Graph API) for identity lifecycle and migration tasks.
Automation skills (PowerShell, Graph API) for identity lifecycle and migration tasks.
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Lead .Net Software Developer
Lead .Net Software Developer
Hireful
Milton Keynes, Buckinghamshire, MK9
£65k - £75k base salary + bonus and great benefits
Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
FEATURED
Related Jobs
Locations
- The City, City (EC4)
- Shoreditch
- Hinxton
- Southwark
- The City, City (EC3)
- Arundel Heights
- Causeway
- Covent Garden
- Datchet Common
- Euston
- City of London
- Central London
- Milton Keynes
- South East London
- West End
- East London
- Reading
- Stevenage
- West London
- Borehamwood
- London
- Hertfordshire
- Berkshire
- Buckinghamshire
- Essex
- Oxfordshire
- Surrey
- West Sussex
- Cambridgeshire
- East Sussex
- South East
- East Anglia